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motikmotik
3 years ago
9

Help me please please

Mathematics
1 answer:
Yuki888 [10]3 years ago
6 0

Answer:

the answer would be B I believe

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A science test, which is worth 100 points, consists of 24 questions. Each question is worth either 3 points or 5 points. If x is
Dennis_Churaev [7]

Answer:

The test contains 10 three-point questions and 14 five-point questions

Step-by-step explanation:

Given equations are:

x+y = 24\\and\\3x+5y=100

From 2nd equation we can deduce that x represents number of 3-point questions and y represents number of 5-point questions.

Using the substitution method:

From x+y = 24

y= 24-x

Putting this valu of y in 3x+5y=100

3x+5(24-x) = 100\\3x + 120 - 5x = 100\\-2x+120=100\\-2x = 100-120\\-2x = -20\\\frac{-2x}{-2} = \frac{-20}{-2}\\ x = 10\\Putting\ the\ value\ of\ x\ in\ x+y=24\\10+y=24\\y = 24-10\\y = 14

Hence, the correct answer is:

The test contains 10 three-point questions and 14 five-point questions..

8 0
4 years ago
The lines shown below are parallel. If the green line have a slope of -3, what is the slope of the red line
abruzzese [7]

Answer:

The slope of the red line would also be -3

Step-by-step explanation:

This is because parallel lines have the same slope. So if the lines are parallel and the green one has a slope of -3, then the red one must also have a slope of -3.

7 0
3 years ago
There are 20 students in a drama class. The mean age of 12 students is 18 years. The mean age of the remaining 8 students of the
Marta_Voda [28]

Answer:

Step-by-step explanation:

Total sum of age of 12 students = 12*18 = 216;

Total sum of age of 8 students = 8*23 = 184;

Total sum of age of 20 students = 216+184 = 400;

Mean age of all the students = total age / number of students;

= 400/20 = 20 year

Step-by-step explanation:

3 0
3 years ago
Felipe trabaja en una construcción ayuda a cotizar materiales entre ellos cables para diversos propósitos el arquitecto le pidió
Alekssandra [29.7K]

Answer:

a) 0.64mm

b) 7/25

Step-by-step explanation:

Felipe trabaja en una construcción ayuda a cotizar materiales entre ellos cables para diversos propósitos.El arquitecto le pidió cotizar un cable de 16/25 mm de diámetro. en los catálogos disponibles en as tiendas las medidas aparecen expresadas en números decimales como se muestra en la imagen

¿Que debe hacer felipe para saber el diámetro del cable que pidió el arquitecto?

¿que medida en forma de fracción le corresponde al cable que mide 0.28? ¿como lo determinaste? es urgenteeee GRACIAS

a) Dada la dimensión fraccionaria del cable expresada como 16/25 mm, dado que Felipe debe expresar esta fracción en decimal para obtener la medida requerida, dividiremos la expresión usando una división larga como se muestra en el anexo. Desde el archivo adjunto;

16/25 mm = 0,64 mm

b) La medida fraccionaria corresponde al cable que mide 0.28 se expresa como se muestra. Convertir 0,28 a fracción.

0.28 = 28/100 (Tenga en cuenta que dividimos por 100 porque hay dos valores decimales después del punto decimal)

Sobre la simplificación en su término más bajo

28/100 = 4 * 7/4 * 25

28/100 = 4/4 * 7/25

28/100 = 1 * 7/25

28/100 = 7/25

Por lo tanto, la medida fraccionaria que corresponde al cable que mide 0.28 es 7/25.

8 0
4 years ago
How many times longer is the diameter of a grain of sand than the diameter of the average cell in the human body? Show your work
sveta [45]
Diameter of grain of sand is = 2*10^{-4}

Diameter of Human hair is = 0.000025

We can write it as = 2.5*10^{-5}

So the ratio of diameter of grain of sand to diameter of human hair is 
= \frac{2*10^{-4}}{2.5*10^{-5}} = 8

So we can say diameter of grain of sand is 8 times longer than the diameter of average cell in human body.
 
8 0
4 years ago
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